<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>Document</title>
		<style>
			* {
				padding: 0;
				margin: 0;
			}

			table, td {
				border: 2px solid black;
			}

			table {
				border-collapse: collapse;
			}
			table {
				width: 100%;
			}

			td {
				width: 25%;
				height: 200px;
			}

			.left, .right {
				height: 800px;
			}

			


		</style>
	</head>
	<body>

		<table>
			<tr>
				<td></td>
				<td></td>
				<td></td>
				<td></td>
			</tr>

			<tr>
				<td class="left" colspan="2"></td>
				<td class="right" colspan="2"></td>
			</tr>


		</table>
		
	</body>
</html>
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	作业2: 总结之前的知识
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